libavformat/idroqdec.c

   1 /*
   2  * id RoQ (.roq) File Demuxer
   3  * Copyright (c) 2003 The ffmpeg Project
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * id RoQ format file demuxer
  25  * by Mike Melanson (melanson@pcisys.net)
  26  * for more information on the .roq file format, visit:
  27  *   http://www.csse.monash.edu.au/~timf/
  28  */
  29
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "avformat.h"
  33 #include "internal.h"
  34
  35 #define RoQ_MAGIC_NUMBER 0x1084
  36 #define RoQ_CHUNK_PREAMBLE_SIZE 8
  37 #define RoQ_AUDIO_SAMPLE_RATE 22050
  38 #define RoQ_CHUNKS_TO_SCAN 30
  39
  40 #define RoQ_INFO           0x1001
  41 #define RoQ_QUAD_CODEBOOK  0x1002
  42 #define RoQ_QUAD_VQ        0x1011
  43 #define RoQ_SOUND_MONO     0x1020
  44 #define RoQ_SOUND_STEREO   0x1021
  45
  46 typedef struct RoqDemuxContext {
  47
  48     int frame_rate;
  49     int width;
  50     int height;
  51     int audio_channels;
  52
  53     int video_stream_index;
  54     int audio_stream_index;
  55
  56     int64_t video_pts;
  57     unsigned int audio_frame_count;
  58
  59 } RoqDemuxContext;
  60
  61 static int roq_probe(AVProbeData *p)
  62 {
  63     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
  64         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
  65         return 0;
  66
  67     return AVPROBE_SCORE_MAX;
  68 }
  69
  70 static int roq_read_header(AVFormatContext *s)
  71 {
  72     RoqDemuxContext *roq = s->priv_data;
  73     AVIOContext *pb = s->pb;
  74     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
  75
  76     /* get the main header */
  77     if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
  78         RoQ_CHUNK_PREAMBLE_SIZE)
  79         return AVERROR(EIO);
  80     roq->frame_rate = AV_RL16(&preamble[6]);
  81
  82     /* init private context parameters */
  83     roq->width = roq->height = roq->audio_channels = roq->video_pts =
  84     roq->audio_frame_count = 0;
  85     roq->audio_stream_index = -1;
  86     roq->video_stream_index = -1;
  87
  88     s->ctx_flags |= AVFMTCTX_NOHEADER;
  89
  90     return 0;
  91 }
  92
  93 static int roq_read_packet(AVFormatContext *s,
  94                            AVPacket *pkt)
  95 {
  96     RoqDemuxContext *roq = s->priv_data;
  97     AVIOContext *pb = s->pb;
  98     int ret = 0;
  99     unsigned int chunk_size;
 100     unsigned int chunk_type;
 101     unsigned int codebook_size;
 102     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
 103     int packet_read = 0;
 104     int64_t codebook_offset;
 105
 106     while (!packet_read) {
 107
 108         if (s->pb->eof_reached)
 109             return AVERROR(EIO);
 110
 111         /* get the next chunk preamble */
 112         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
 113             RoQ_CHUNK_PREAMBLE_SIZE)
 114             return AVERROR(EIO);
 115
 116         chunk_type = AV_RL16(&preamble[0]);
 117         chunk_size = AV_RL32(&preamble[2]);
 118         if(chunk_size > INT_MAX)
 119             return AVERROR_INVALIDDATA;
 120
 121         switch (chunk_type) {
 122
 123         case RoQ_INFO:
 124             if (roq->video_stream_index == -1) {
 125                 AVStream *st = avformat_new_stream(s, NULL);
 126                 if (!st)
 127                     return AVERROR(ENOMEM);
 128                 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
 129                 roq->video_stream_index = st->index;
 130                 st->codec->codec_type   = AVMEDIA_TYPE_VIDEO;
 131                 st->codec->codec_id     = AV_CODEC_ID_ROQ;
 132                 st->codec->codec_tag    = 0;  /* no fourcc */
 133
 134                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
 135                     return AVERROR(EIO);
 136                 st->codec->width  = roq->width  = AV_RL16(preamble);
 137                 st->codec->height = roq->height = AV_RL16(preamble + 2);
 138                 break;
 139             }
 140             /* don't care about this chunk anymore */
 141             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
 142             break;
 143
 144         case RoQ_QUAD_CODEBOOK:
 145             /* packet needs to contain both this codebook and next VQ chunk */
 146             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
 147             codebook_size = chunk_size;
 148             avio_skip(pb, codebook_size);
 149             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
 150                 RoQ_CHUNK_PREAMBLE_SIZE)
 151                 return AVERROR(EIO);
 152             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
 153                 codebook_size;
 154
 155             /* rewind */
 156             avio_seek(pb, codebook_offset, SEEK_SET);
 157
 158             /* load up the packet */
 159             ret= av_get_packet(pb, pkt, chunk_size);
 160             if (ret != chunk_size)
 161                 return AVERROR(EIO);
 162             pkt->stream_index = roq->video_stream_index;
 163             pkt->pts = roq->video_pts++;
 164
 165             packet_read = 1;
 166             break;
 167
 168         case RoQ_SOUND_MONO:
 169         case RoQ_SOUND_STEREO:
 170             if (roq->audio_stream_index == -1) {
 171                 AVStream *st = avformat_new_stream(s, NULL);
 172                 if (!st)
 173                     return AVERROR(ENOMEM);
 174                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
 175                 roq->audio_stream_index = st->index;
 176                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 177                 st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM;
 178                 st->codec->codec_tag = 0;  /* no tag */
 179                 if (chunk_type == RoQ_SOUND_STEREO) {
 180                     st->codec->channels       = 2;
 181                     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 182                 } else {
 183                     st->codec->channels       = 1;
 184                     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 185                 }
 186                 roq->audio_channels    = st->codec->channels;
 187                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
 188                 st->codec->bits_per_coded_sample = 16;
 189                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
 190                     st->codec->bits_per_coded_sample;
 191                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 192             }
 193         case RoQ_QUAD_VQ:
 194             /* load up the packet */
 195             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
 196                 return AVERROR(EIO);
 197             /* copy over preamble */
 198             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
 199
 200             if (chunk_type == RoQ_QUAD_VQ) {
 201                 pkt->stream_index = roq->video_stream_index;
 202                 pkt->pts = roq->video_pts++;
 203             } else {
 204                 pkt->stream_index = roq->audio_stream_index;
 205                 pkt->pts = roq->audio_frame_count;
 206                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
 207             }
 208
 209             pkt->pos= avio_tell(pb);
 210             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
 211                 chunk_size);
 212             if (ret != chunk_size)
 213                 ret = AVERROR(EIO);
 214
 215             packet_read = 1;
 216             break;
 217
 218         default:
 219             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
 220             return AVERROR_INVALIDDATA;
 221         }
 222     }
 223
 224     return ret;
 225 }
 226
 227 AVInputFormat ff_roq_demuxer = {
 228     .name           = "roq",
 229     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ"),
 230     .priv_data_size = sizeof(RoqDemuxContext),
 231     .read_probe     = roq_probe,
 232     .read_header    = roq_read_header,
 233     .read_packet    = roq_read_packet,
 234 };